:root {
  --bg: #0f1114;
  --bg-elevated: #171a1f;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.06);
  --surface-raised: rgba(22, 26, 31, 0.84);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.16);
  --line: rgba(255, 255, 255, 0.07);
  --text: #f4f3ef;
  --text-dim: rgba(244, 243, 239, 0.74);
  --text-soft: rgba(244, 243, 239, 0.52);
  --accent: #d96a1d;
  --accent-strong: #ee7e2f;
  --accent-soft: rgba(217, 106, 29, 0.18);
  --success: #77c189;
  --warning: #d7ac59;
  --danger: #cf7757;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --shadow-soft: 0 18px 48px rgba(0, 0, 0, 0.22);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 20px;
  --radius-pill: 999px;
  --glass-blur: 18px;
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.9rem;
  --text-3xl: clamp(2.4rem, 5vw, 4.5rem);
  --font-sans: "Geist", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 140ms;
  --duration-normal: 240ms;
  --duration-slow: 420ms;
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(circle at top left, rgba(217, 106, 29, 0.12), transparent 24%),
    linear-gradient(180deg, #111317 0%, #0d0f12 100%);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 0;
}

.site-shell,
.detail-page,
.guide-page,
.site-footer {
  width: min(1400px, calc(100% - 48px));
  margin: 0 auto;
}

.site-shell,
.detail-page,
.guide-page {
  padding: 28px 0 48px;
}

.page-main {
  display: grid;
  gap: var(--space-xl);
}

.hero {
  display: grid;
  gap: var(--space-xl);
}

.hero-curated {
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: start;
  min-height: 100dvh;
  padding-bottom: var(--space-lg);
}

.hero-copy {
  display: grid;
  align-content: center;
  gap: var(--space-lg);
  padding: min(8vw, 92px) 0 var(--space-xl);
}

.eyebrow,
.panel-kicker,
.meta-kicker,
.step-index {
  margin: 0;
  color: var(--accent-strong);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1,
.detail-hero h1,
.guide-hero h1 {
  margin: 0;
  font-size: var(--text-3xl);
  line-height: 0.95;
  letter-spacing: -0.04em;
  max-width: 12ch;
}

.hero-text,
.detail-subtitle,
.detail-copy,
.step-copy,
.guide-copy,
.section-note,
.control-group-head p,
.results-live-text,
.result-summary-caption {
  margin: 0;
  max-width: 65ch;
  color: var(--text-dim);
  font-size: var(--text-base);
}

.hero-text {
  font-size: var(--text-lg);
}

.hero-actions,
.detail-actions,
.action-row,
.filter-rail,
.hero-panel-head,
.section-heading,
.section-heading-inline,
.control-topline {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero-actions,
.detail-actions,
.action-row {
  flex-wrap: wrap;
}

.hero-rail {
  display: grid;
  gap: var(--space-md);
  padding-top: 20px;
}

.hero-panel,
.control-panel,
.page-card,
.case-stage,
.guide-step,
.summary-item,
.callout-panel,
.notice-panel,
.error-panel,
.code-block {
  border: 1px solid var(--border);
  background: var(--surface-raised);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-soft);
}

.hero-panel,
.control-panel,
.page-card {
  border-radius: var(--radius-xl);
}

.hero-panel,
.control-panel,
.page-card {
  position: relative;
}

.hero-panel::before,
.control-panel::before,
.page-card::before,
.summary-item::before,
.callout-panel::before,
.notice-panel::before,
.error-panel::before,
.code-block::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.05);
  pointer-events: none;
}

.hero-search-panel,
.hero-preview-panel,
.control-panel,
.page-card {
  padding: 22px;
}

.hero-panel-head,
.section-heading,
.section-heading-inline,
.control-topline {
  justify-content: space-between;
}

.hero-panel-head h2,
.section-heading h2,
.section-heading-inline h2,
.detail-section h2,
.control-topline h2 {
  margin: 4px 0 0;
  font-size: var(--text-xl);
  line-height: 1.2;
}

.hero-summary,
.result-summary,
.summary-value,
.metric-value,
.source-inline,
.source-link {
  font-family: var(--font-mono);
}

.hero-summary,
.result-summary,
.result-summary-caption {
  font-size: var(--text-sm);
}

.hero-summary,
.result-summary {
  color: var(--accent-strong);
}

.search-stack {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.search-field {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  width: 14px;
  height: 14px;
  transform: translateY(-50%);
  border: 2px solid var(--text-soft);
  border-radius: 50%;
}

.search-icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -5px;
  width: 7px;
  height: 2px;
  background: var(--text-soft);
  transform: rotate(45deg);
  border-radius: 999px;
}

.search-input,
.sort-select,
.copy-button,
.chip,
.toggle-chip,
.ghost-link,
.primary-link,
.secondary-link-button,
.path-card,
.pager-card,
.related-card,
.case-card,
.button-link {
  transition:
    transform var(--duration-normal) var(--ease-spring),
    border-color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    opacity var(--duration-fast) var(--ease-out);
}

.search-input,
.sort-select {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.search-input {
  padding: 0 18px 0 46px;
}

.sort-field {
  display: grid;
  gap: var(--space-xs);
  min-width: 220px;
  color: var(--text-soft);
  font-size: var(--text-sm);
}

.sort-select {
  padding: 0 16px;
}

.search-input:focus,
.sort-select:focus,
.copy-button:focus,
.chip:focus,
.toggle-chip:focus,
.ghost-link:focus,
.primary-link:focus,
.secondary-link-button:focus,
.path-card:focus,
.pager-card:focus,
.related-card:focus,
.case-card:focus,
.button-link:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(217, 106, 29, 0.18);
}

.search-input::placeholder {
  color: var(--text-soft);
}

.start-paths {
  display: grid;
  gap: 10px;
}

.path-card {
  min-height: 88px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.025);
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.path-card:hover,
.path-card.is-active {
  background: rgba(217, 106, 29, 0.08);
  border-color: rgba(217, 106, 29, 0.28);
  transform: translateY(-1px);
}

.path-card:active,
.chip:active,
.toggle-chip:active,
.ghost-link:active,
.primary-link:active,
.secondary-link-button:active,
.copy-button:active,
.pager-card:active,
.related-card:active,
.case-card:active,
.button-link:active {
  transform: translateY(1px) scale(0.98);
}

.path-title,
.case-card-title,
.preview-card-title,
.related-card-title,
.pager-title,
.summary-value,
.guide-step h2,
.step-title {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.path-copy,
.preview-card-copy,
.preview-card-meta,
.case-card-desc,
.case-card-source,
.related-card-meta,
.summary-label,
.site-footer,
.detail-meta-copy,
.code-caption {
  color: var(--text-soft);
  font-size: var(--text-sm);
}

.hero-preview,
.guide-steps,
.detail-grid,
.summary-grid,
.filter-shell,
.filter-cluster,
.case-grid,
.related-grid,
.pager-grid {
  display: grid;
  gap: var(--space-md);
}

.preview-card {
  display: grid;
  gap: 14px;
  min-height: 220px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.025);
}

.preview-card-title {
  margin: 0;
}

.preview-card-copy,
.case-card-desc,
.detail-subtitle {
  line-height: 1.7;
}

.preview-card-meta,
.case-card-footer,
.detail-meta,
.detail-meta-strip,
.guide-copy-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.control-panel {
  padding: 24px;
}

.control-meta {
  display: grid;
  gap: 6px;
  justify-items: end;
}

.filter-shell {
  margin-top: var(--space-lg);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(220px, 0.5fr);
  align-items: start;
}

.filter-cluster {
  gap: 12px;
}

.control-group-head h3 {
  margin: 0;
  font-size: var(--text-base);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip,
.toggle-chip,
.ghost-link,
.secondary-link-button,
.copy-button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-dim);
  cursor: pointer;
  text-decoration: none;
}

.chip.is-active,
.toggle-chip.is-active {
  border-color: rgba(217, 106, 29, 0.55);
  background: rgba(217, 106, 29, 0.16);
  color: #fff;
}

.primary-link,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent);
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  color: #fff;
  text-decoration: none;
  box-shadow: 0 12px 26px rgba(217, 106, 29, 0.18);
  cursor: pointer;
}

.secondary-link,
.secondary-link-button,
.ghost-link {
  color: var(--text);
}

.library-section {
  display: grid;
  gap: var(--space-md);
}

.case-grid {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.case-card {
  display: grid;
  gap: 14px;
  min-height: 220px;
  padding: 18px;
  border-top: 1px solid var(--border-strong);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-left: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.025);
  text-decoration: none;
  color: inherit;
  grid-column: span 4;
}

.case-card.is-featured:nth-child(6n + 1),
.case-card.is-featured:nth-child(6n + 4) {
  grid-column: span 6;
}

.case-card:hover,
.related-card:hover,
.pager-card:hover,
.ghost-link:hover,
.secondary-link-button:hover,
.button-link:hover,
.copy-button:hover {
  transform: translateY(-2px);
  border-color: rgba(217, 106, 29, 0.28);
  background: rgba(255, 255, 255, 0.05);
}

.case-card-header {
  display: grid;
  gap: 10px;
}

.case-card-title {
  margin: 0;
}

.case-card-desc {
  margin: 0;
  min-height: 3.6em;
}

.case-card-footer {
  justify-content: space-between;
  align-items: flex-end;
  margin-top: auto;
}

.case-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag,
.difficulty-badge,
.featured-pill,
.summary-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: var(--text-xs);
  font-weight: 600;
}

.tag,
.difficulty-badge,
.summary-badge {
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
}

.featured-pill {
  color: #fff;
  background: rgba(217, 106, 29, 0.18);
  border-color: rgba(217, 106, 29, 0.28);
}

.tag-dev,
.tag-content,
.tag-auto,
.tag-data,
.tag-finance,
.tag-creative,
.tag-knowledge,
.tag-devops {
  color: var(--text-dim);
}

.difficulty-badge.diff-beginner {
  color: var(--success);
}

.difficulty-badge.diff-intermediate {
  color: var(--warning);
}

.difficulty-badge.diff-advanced {
  color: var(--danger);
}

.empty-state,
.error-panel,
.notice-panel {
  border-radius: var(--radius-lg);
  padding: 24px;
}

.empty-state {
  border: 1px dashed var(--border-strong);
  background: rgba(255, 255, 255, 0.02);
}

.empty-title {
  margin: 0;
  font-size: var(--text-xl);
}

.empty-body {
  margin: 10px 0 0;
  color: var(--text-dim);
}

.empty-actions {
  margin-top: 18px;
}

.button-link {
  appearance: none;
}

.load-skeleton-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-md);
}

.skeleton-card {
  grid-column: span 4;
  min-height: 220px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  background-size: 240% 100%;
  animation: shimmer 1.6s infinite linear;
}

.skeleton-card.is-wide {
  grid-column: span 6;
}

.loading-block {
  display: grid;
  gap: var(--space-md);
  min-height: 360px;
  align-content: start;
  text-align: left;
}

.detail-page,
.guide-page {
  min-height: 100dvh;
}

.page-card {
  padding: 24px;
}

.detail-actions {
  margin-bottom: 18px;
}

.detail-hero,
.guide-hero {
  display: grid;
  gap: 18px;
}

.detail-grid {
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.75fr);
  align-items: start;
  margin-top: var(--space-lg);
}

.detail-main {
  display: grid;
  gap: var(--space-lg);
}

.detail-main h1,
.guide-hero h1 {
  max-width: 12ch;
}

.detail-meta {
  align-items: center;
}

.detail-side {
  display: grid;
  gap: var(--space-md);
}

.summary-grid {
  grid-template-columns: 1fr;
}

.summary-item {
  position: relative;
  padding: 18px;
  border-radius: var(--radius-lg);
}

.summary-label {
  display: block;
  margin-bottom: 8px;
}

.detail-section {
  display: grid;
  gap: 14px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.detail-section h2,
.guide-step h2 {
  margin: 0;
}

.callout-panel,
.notice-panel,
.error-panel,
.guide-step,
.code-block,
.related-card,
.pager-card {
  position: relative;
  border-radius: var(--radius-lg);
}

.callout-panel,
.notice-panel,
.error-panel {
  padding: 18px;
}

.callout-panel p,
.notice-panel p,
.error-panel p {
  margin: 0;
  color: var(--text-dim);
}

.detail-meta-strip {
  align-items: center;
}

.timeline-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  padding: 16px 0 16px 0;
  border-top: 1px solid var(--line);
}

.timeline-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.timeline-item p {
  margin: 0;
  color: var(--text-dim);
}

.timeline-index {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(217, 106, 29, 0.16);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-weight: 700;
}

.related-grid,
.pager-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.related-card,
.pager-card {
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  color: inherit;
  text-decoration: none;
}

.pager-card.is-empty {
  visibility: hidden;
}

.guide-hero {
  margin-bottom: var(--space-lg);
}

.guide-copy-row {
  align-items: center;
}

.guide-steps {
  gap: 18px;
}

.guide-step {
  display: grid;
  gap: 14px;
  padding: 20px;
}

.guide-step-head {
  display: grid;
  gap: 8px;
}

.step-title {
  margin: 0;
}

.code-block {
  overflow: hidden;
  background: rgba(9, 11, 14, 0.88);
}

.code-caption {
  margin: 0;
  padding: 12px 18px 0;
}

.code-block pre {
  margin: 0;
  padding: 18px;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  white-space: pre;
}

.copy-button {
  position: absolute;
  top: 12px;
  right: 12px;
  min-height: 36px;
  padding: 0 12px;
}

.guide-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
}

.site-footer {
  padding-bottom: 36px;
  color: var(--text-soft);
  text-align: center;
  font-size: var(--text-sm);
}

.footer-sep {
  margin: 0 8px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -80% 0;
  }
}

@media (max-width: 1100px) {
  .hero-curated,
  .detail-grid,
  .filter-shell {
    grid-template-columns: 1fr;
  }

  .hero-curated {
    min-height: auto;
  }

  .hero-copy {
    padding-top: 48px;
  }

  .control-meta {
    justify-items: start;
  }

  .case-card,
  .case-card.is-featured:nth-child(6n + 1),
  .case-card.is-featured:nth-child(6n + 4),
  .skeleton-card,
  .skeleton-card.is-wide {
    grid-column: span 6;
  }
}

@media (max-width: 900px) {
  .site-shell,
  .detail-page,
  .guide-page,
  .site-footer {
    width: min(100%, calc(100% - 28px));
  }

  .hero-actions,
  .detail-actions,
  .control-topline,
  .section-heading,
  .hero-panel-head,
  .filter-rail {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-copy {
    padding-top: 28px;
    gap: var(--space-md);
  }

  .hero h1,
  .detail-hero h1,
  .guide-hero h1 {
    max-width: none;
  }

  .case-card,
  .case-card.is-featured:nth-child(6n + 1),
  .case-card.is-featured:nth-child(6n + 4),
  .skeleton-card,
  .skeleton-card.is-wide {
    grid-column: span 12;
  }
}

@media (max-width: 640px) {
  .site-shell,
  .detail-page,
  .guide-page {
    padding-top: 16px;
    padding-bottom: 32px;
  }

  .hero-curated {
    gap: 16px;
    padding-bottom: 0;
  }

  .hero-copy {
    padding-top: 8px;
  }

  .hero h1,
  .detail-hero h1,
  .guide-hero h1 {
    font-size: clamp(2rem, 10vw, 2.7rem);
    line-height: 1;
  }

  .hero-text {
    font-size: var(--text-base);
  }

  .hero-panel,
  .control-panel,
  .page-card,
  .guide-step {
    padding: 18px;
  }

  .search-input,
  .sort-select,
  .chip,
  .toggle-chip,
  .ghost-link,
  .primary-link,
  .secondary-link-button,
  .button-link {
    min-height: 48px;
  }

  .timeline-item {
    grid-template-columns: 30px 1fr;
    gap: 10px;
  }

  .code-block pre {
    padding: 54px 14px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}